<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>XMLHttpRequest_查询参数</title>
</head>

<body>
  <script>
    /**
     * 目标：使用XHR携带查询参数，展示某个省下属的城市列表
    */
  </script>
</body>

</html>